Most VoIP solutions will require stable and consistent internet connectivity at all your office locations where VoIP will be used. At the very least, your business phone system must have access to a business-class internet link, so discuss these needs with your company's internet service provider (ISP). This should be a dedicated link through a dedicated router if you expect your phone calls to sound as if they were coming from a business and not someone's home Skype connection. At a minimum, it's important to have a router that can create virtual LANs (VLANs) and also has the ability to encrypt your voice traffic. These days, you need end-to-end VoIP security for any call.
Marketed as a free virtual phone number solution for entrepreneurs, Sonetel presents an easy way for your business to get local phone numbers on your website. The main purpose behind having phone numbers that appear closer to your customers is to increase conversions. People are more likely to trust businesses that offer local numbers and hence will feel more comfortable purchasing your product or calling your sales teams.

No matter how hard you try to have all of your calls answered each time the phone rings, such an ideal situation may not happen all the time. There are some days in business that are busier than others, and the calls will be left on the line. Hence, you can also use your voicemail for reaching out to clients and marketing activities like cold calling.
If the virtual phone system your business uses does not keep employees connecting, soon this will be reflective in the service you provide. The trickling in of unhappy customers will begin.